4739449721 has 2 divisors, whose sum is σ = 4739449722. Its totient is φ = 4739449720.

The previous prime is 4739449639. The next prime is 4739449733. The reversal of 4739449721 is 1279449374.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2701920400 + 2037529321 = 51980^2 + 45139^2 .

It is a cyclic number.

It is not a de Polignac number, because 4739449721 - 2¹⁸ = 4739187577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4739449721.

It is not a weakly prime, because it can be changed into another prime (4739449021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2369724860 + 2369724861.

It is an arithmetic number, because the mean of its divisors is an integer number (2369724861).

Almost surely, 2^4739449721 is an apocalyptic number.

It is an amenable number.

4739449721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4739449721 is an equidigital number, since it uses as much as digits as its factorization.

4739449721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The square root of 4739449721 is about 68843.6614438831. The cubic root of 4739449721 is about 1679.7422271973.

The spelling of 4739449721 in words is "four billion, seven hundred thirty-nine million, four hundred forty-nine thousand, seven hundred twenty-one".